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Proton nmr data table
This puts the proton in a shielded environment and thus it feels a weaker magnetic field:. Wehrli and T. Constable, B. Davis and C. The Chemical Shift of Connected to sp 3 Hybridized Carbons We can see in the table that sp 3 hybridized C — H bonds in alkanes and cycloalkanes give signal in the upfield region shielded, low resonance frequency at the range of 1—2 ppm. Now, ppm for protons on heteroatoms is a broad range and to recognize these peaks easier, keep in mind that they also appear broader as a result of hydrogen bonding. Jacobsen, N.